WO2018105419A1 - Heavy duty tire and method for manufacturing heavy duty tire - Google Patents

Heavy duty tire and method for manufacturing heavy duty tire Download PDF

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Publication number
WO2018105419A1
WO2018105419A1 PCT/JP2017/042324 JP2017042324W WO2018105419A1 WO 2018105419 A1 WO2018105419 A1 WO 2018105419A1 JP 2017042324 W JP2017042324 W JP 2017042324W WO 2018105419 A1 WO2018105419 A1 WO 2018105419A1
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Prior art keywords
rubber sheet
winding
bead
tire
bead wire
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PCT/JP2017/042324
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French (fr)
Japanese (ja)
Inventor
章史 佐藤
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株式会社ブリヂストン
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Application filed by 株式会社ブリヂストン filed Critical 株式会社ブリヂストン
Priority to CN201780075458.5A priority Critical patent/CN110035908A/en
Priority to EP17878992.1A priority patent/EP3552848A4/en
Priority to US16/466,063 priority patent/US20200031175A1/en
Priority to JP2018554925A priority patent/JPWO2018105419A1/en
Publication of WO2018105419A1 publication Critical patent/WO2018105419A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B60C15/04—Bead cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/48—Bead-rings or bead-cores; Treatment thereof prior to building the tyre
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B60C15/04—Bead cores
    • B60C2015/042—Bead cores characterised by the material of the core, e.g. alloy
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B60C15/04—Bead cores
    • B60C2015/044—Bead cores characterised by a wrapping layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C2200/00—Tyres specially adapted for particular applications
    • B60C2200/06—Tyres specially adapted for particular applications for heavy duty vehicles

Definitions

  • the present invention relates to a heavy load tire and a method for manufacturing a heavy load tire, and more particularly to a heavy load tire having excellent separation resistance around a bead core and a method for manufacturing a heavy load tire.
  • tires used in harsh environments such as heavy-duty tires may be used in harsher conditions, such as being used at high speeds and high loads, requiring high durability and deterioration resistance.
  • the present invention has been made in view of the above problems, and an object thereof is to provide a heavy load tire and a heavy load tire manufacturing method in which the separation resistance around the bead core is improved.
  • the present inventor has found that the separation resistance around the bead core is improved by using a rubber sheet, which will be described later, instead of the conventional organic fiber tape, and has completed the present invention.
  • the heavy duty tire according to the first feature includes a bead core formed by winding a bead wire a plurality of times in an annular shape, and a rubber sheet made of a rubber material.
  • the rubber sheet is wound around a region including one end and the other end of the bead wire. One end is the end closest to the other end in the tire circumferential direction.
  • the rubber sheet has a 50% elongation tensile stress M50 measured by JIS K6251 at a measurement temperature of 25 degrees, and is 1.0 MPa or more after vulcanization.
  • the method for manufacturing a heavy duty tire according to the first feature includes a step of winding a rubber sheet made of a rubber material around a region including one end and the other end of a bead wire, and vulcanizing after winding the rubber sheet.
  • a process. One end is the end closest to the other end in the tire circumferential direction.
  • the separation resistance around the bead core in the heavy duty tire is improved.
  • FIG. 1 is a schematic cross-sectional view showing a part of a cross section along the tread width direction of the heavy duty tire according to the embodiment of the present invention and perpendicular to the tire circumferential direction.
  • FIG. 2 is a perspective view showing a part of the bead core.
  • FIG. 3 is a flowchart showing a method for manufacturing a heavy duty tire according to an embodiment of the present invention.
  • FIG. 4 is a graph showing the relationship between the crack area around the bead core and the angle from the end of the bead wire.
  • the heavy load tire 1 is applied to a heavy load vehicle such as a construction vehicle.
  • a heavy load tire 1 includes a pair of bead portions 2 that contact a rim (not shown), a carcass layer 3 that forms a skeleton of the heavy load tire 1, and a tread portion that includes a contact surface that contacts a road surface. 4 and.
  • the bead part 2 has a bead core 5 and a bead filler 6.
  • the carcass layer 3 extends between the bead cores 5 in a toroidal shape.
  • the at least two bead cores 5 are arranged apart from each other in the tread width direction.
  • the bead core 5 is formed by winding a single bead wire 8 a plurality of times in an annular shape.
  • the bead core 5 supports the cord tension of the carcass layer 3 generated by the internal pressure of the heavy load tire 1.
  • the bead wire 8 is coated with a rubber material.
  • the bead filler 6 is a rubber material for reinforcing the bead core 5, and is disposed in a space formed by folding both end portions of the carcass layer 3 outward in the tire width direction at the position of the bead core 5.
  • a belt layer 7 is provided between the carcass layer 3 and the tread portion 4.
  • a plurality of belt layers 7 are stacked along the tire circumferential direction.
  • the winding start end portion 8a and the winding end end portion 8b of the bead wire 8 are wound so as to overlap in the radial direction of the bead core 5 (the radial direction of the heavy load tire 1). Then, as shown in FIG. 2, the rubber sheet 10 is wound around a region where the winding start end portion 8 a and the winding end end portion 8 b of the bead wire 8 overlap and a region in the vicinity thereof. The rubber sheet 10 is wound around a region including the winding start end portion 8 a and the winding end end portion 8 b of the bead wire 8. In other words, the rubber sheet 10 is wound around a region including one end and the other end of the bead wire 8.
  • One end portion is the end portion closest to the other end portion in the tire circumferential direction. That is, the winding start end 8a is the end closest to the winding end 8b in the tire circumferential direction.
  • the winding end 8b is the end closest to the winding start 8a in the tire circumferential direction.
  • the number of the bead wires 8 is one more in the region where the winding start end portion 8a and the winding end end portion 8b of the bead wire 8 overlap than in the other regions.
  • the region where the winding start end portion 8a and the winding end end portion 8b of the bead wire 8 overlap and the vicinity thereof are referred to as the end portion of the bead wire 8.
  • the rubber sheet 10 used in the present embodiment is mainly composed of natural rubber, but is not limited thereto.
  • the rubber sheet 10 has a 50% elongation tensile stress M50 measured by JIS K6251 at a measurement temperature of 25 degrees, and is 1.0 MPa or more after vulcanization.
  • the dimension of the rubber sheet 10 used by this embodiment is 45 mm in width, 1 mm in thickness, and 400 mm in length, it is not limited to this.
  • the rubber sheet 10 is wound around the end of the bead wire 8 three times, but the number of times the rubber sheet 10 is wound is not limited to three.
  • the rubber sheet 10 3 times it is preferable to wind so that the rubber sheet 10 may not be overlapped as shown in FIG.
  • the rubber sheet 10 is spirally wound in the circumferential direction of the ring, but is not limited thereto.
  • the winding method is not limited as long as the winding start end portion 8a and the winding end end portion 8b are included. For example, the same place may be wound a plurality of times. However, it is preferable to wind the rubber sheet 10 so that it does not overlap three times.
  • the manufacturing method of the heavy duty tire 1 which concerns on this embodiment is demonstrated.
  • the method for manufacturing the heavy duty tire 1 includes a bead core forming step S10, a rubber sheet winding step S20, and a vulcanizing step S30.
  • the bead core forming step S10 is a step of forming the bead core 5 by winding one bead wire 8 in an annular shape a plurality of times.
  • the rubber sheet winding step S20 is a step of winding the rubber sheet 10 around a region including the winding start end portion 8a and the winding end end portion 8b of the bead wire 8.
  • the vulcanization step S30 is a step of obtaining a heavy load tire 1 by vulcanizing a raw tire including the bead core 5 around which the rubber sheet 10 is wound.
  • FIG. 4 indicates the position in the tire circumferential direction when the end of the bead wire 8 is used as a reference (0 degree).
  • the vertical axis shown in FIG. 4 indicates the crack area (index) around the bead core 5. The lower the numerical value on the vertical axis shown in FIG. 4, the better the separation resistance.
  • the crack area is greatly reduced when the rubber sheet 10 is wound around the end portion of the bead wire 8 as compared with the case where the conventional organic fiber tape is wound. That is, it can be seen that the separation resistance around the bead core 5 is improved by using the rubber sheet 10 instead of the organic fiber tape.
  • the reason for such a measurement result is that the adhesion between the bead wire 8 coated with the rubber material and the rubber sheet 10 is better than the adhesion between the bead wire 8 coated with the rubber material and the conventional organic fiber tape. Because.
  • the heavy load tire 1 includes the rubber sheet 10, and the rubber sheet 10 is wound around a region including the winding start end portion 8 a and the winding end end portion 8 b of the bead wire 8. .
  • the separation resistance around the bead core 5 in the heavy load tire 1 is improved.

Abstract

This heavy duty tire (1) is provided with: a bead core (5) formed by annularly winding a bead wire (8) a plurality of times; and a rubber sheet (10) consisting of a rubber material. The rubber sheet (10) is wrapped on a region including one end and the other end of the bead wire (8). The one end is the end closest, in the circumferential direction of the tire, to the other end.

Description

重荷重用タイヤ及び重荷重用タイヤの製造方法Heavy load tire and method for manufacturing heavy load tire
　本発明は、重荷重用タイヤ及び重荷重用タイヤの製造方法に関し、詳しくはビードコア周りの耐セパレーション性に優れる重荷重用タイヤ及び重荷重用タイヤの製造方法に関する。 The present invention relates to a heavy load tire and a method for manufacturing a heavy load tire, and more particularly to a heavy load tire having excellent separation resistance around a bead core and a method for manufacturing a heavy load tire.
　ビードワイヤが円環状に巻かれて形成されるビードコアにおいて、ビードワイヤの跳ね上がりを抑制する技術が知られている。特許文献１に記載された発明では、ビードワイヤの端部を有機繊維テープで巻き付けることによりビードワイヤの跳ね上がりを抑制している。 In a bead core formed by winding a bead wire in an annular shape, a technology for suppressing the jump-up of the bead wire is known. In the invention described in Patent Document 1, jumping up of the bead wire is suppressed by winding the end portion of the bead wire with an organic fiber tape.
特開２０１６－８８２５９号公報JP 2016-88259 A
　ところで、重荷重用タイヤのように過酷な環境下で用いられるタイヤでは、高速、高荷重で使用されるなど、さらに過酷な使用条件となる場合があり、高度な耐久性や耐劣化性が要求される。具体的には、ビードコア周りの耐セパレーション性向上の要求が想定される。 By the way, tires used in harsh environments such as heavy-duty tires may be used in harsher conditions, such as being used at high speeds and high loads, requiring high durability and deterioration resistance. The Specifically, a demand for improvement in separation resistance around the bead core is assumed.
　本発明は、上記問題に鑑みて成されたものであり、その目的は、ビードコア周りの耐セパレーション性が向上する重荷重用タイヤ及び重荷重用タイヤの製造方法を提供することである。 The present invention has been made in view of the above problems, and an object thereof is to provide a heavy load tire and a heavy load tire manufacturing method in which the separation resistance around the bead core is improved.
　本発明者は鋭意検討した結果、従来の有機繊維テープの代わりに後述するゴムシートを用いることにより、ビードコア周りの耐セパレーション性が向上することを見出して、本発明を完成するに至った。 As a result of intensive studies, the present inventor has found that the separation resistance around the bead core is improved by using a rubber sheet, which will be described later, instead of the conventional organic fiber tape, and has completed the present invention.
　第１の特徴に係る重荷重用タイヤは、ビードワイヤが円環状に複数回巻かれて形成されるビードコアと、ゴム材からなるゴムシートとを備える。ゴムシートは、ビードワイヤの一方の端部と他方の端部とを含む領域に巻き付けられる。一方の端部は、タイヤ周方向において、他方の端部から最も近い端部である。 The heavy duty tire according to the first feature includes a bead core formed by winding a bead wire a plurality of times in an annular shape, and a rubber sheet made of a rubber material. The rubber sheet is wound around a region including one end and the other end of the bead wire. One end is the end closest to the other end in the tire circumferential direction.
　第１の特徴において、ゴムシートは、測定温度２５度の条件下で、ＪＩＳ　Ｋ６２５１にて測定する５０％伸び引っ張り応力Ｍ５０が、加硫後において１．０ＭＰａ以上である。 In the first feature, the rubber sheet has a 50% elongation tensile stress M50 measured by JIS K6251 at a measurement temperature of 25 degrees, and is 1.0 MPa or more after vulcanization.
　第１の特徴に係る重荷重用タイヤの製造方法は、ビードワイヤの一方の端部と他方の端部とを含む領域にゴム材からなるゴムシートを巻き付ける工程と、ゴムシートを巻き付けた後に加硫する工程と、を備える。一方の端部は、タイヤ周方向において、他方の端部から最も近い端部である。 The method for manufacturing a heavy duty tire according to the first feature includes a step of winding a rubber sheet made of a rubber material around a region including one end and the other end of a bead wire, and vulcanizing after winding the rubber sheet. A process. One end is the end closest to the other end in the tire circumferential direction.
　本発明によれば、重荷重用タイヤにおけるビードコア周りの耐セパレーション性が向上する。 According to the present invention, the separation resistance around the bead core in the heavy duty tire is improved.
図１は、本発明の実施形態に係る重荷重用タイヤのトレッド幅方向に沿い、かつタイヤ周方向に直交する断面の一部を示す模式断面図である。FIG. 1 is a schematic cross-sectional view showing a part of a cross section along the tread width direction of the heavy duty tire according to the embodiment of the present invention and perpendicular to the tire circumferential direction. 図２は、ビードコアの一部分を示す斜視図である。FIG. 2 is a perspective view showing a part of the bead core. 図３は、本発明の実施形態に係る重荷重用タイヤの製造方法を示すフローチャートである。FIG. 3 is a flowchart showing a method for manufacturing a heavy duty tire according to an embodiment of the present invention. 図４は、ビードコア周りの亀裂面積とビードワイヤ端部からの角度との関係を示すグラフである。FIG. 4 is a graph showing the relationship between the crack area around the bead core and the angle from the end of the bead wire.
　以下、本発明の実施形態について、図面を参照して説明する。図面の記載において同一部分には同一符号を付して説明を省略する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the drawings, the same portions are denoted by the same reference numerals, and description thereof is omitted.
　図１を参照して、本実施形態に係る重荷重用タイヤ１の構成について説明する。本実施形態に係る重荷重用タイヤ１は、建設車両などの重荷重車両に適用される。 With reference to FIG. 1, the structure of the heavy duty tire 1 which concerns on this embodiment is demonstrated. The heavy load tire 1 according to the present embodiment is applied to a heavy load vehicle such as a construction vehicle.
　図１に示すように、重荷重用タイヤ１は、リム（不図示）に接する一対のビード部２と、重荷重用タイヤ１の骨格を形成するカーカス層３と、路面と接する接地面を有するトレッド部４と、を有する。 As shown in FIG. 1, a heavy load tire 1 includes a pair of bead portions 2 that contact a rim (not shown), a carcass layer 3 that forms a skeleton of the heavy load tire 1, and a tread portion that includes a contact surface that contacts a road surface. 4 and.
　ビード部２は、ビードコア５と、ビードフィラー６とを有する。カーカス層３は、ビードコア５間にトロイド状に延在する。 The bead part 2 has a bead core 5 and a bead filler 6. The carcass layer 3 extends between the bead cores 5 in a toroidal shape.
　ビードコア５は、トレッド幅方向に離間して少なくとも２つ配置される。また、ビードコア５は、１本のビードワイヤ８が円環状に複数回巻かれて形成される。ビードコア５は、重荷重用タイヤ１の内圧によって発生するカーカス層３のコード張力を支える。ビードワイヤ８は、ゴム材で被膜されている。 The at least two bead cores 5 are arranged apart from each other in the tread width direction. The bead core 5 is formed by winding a single bead wire 8 a plurality of times in an annular shape. The bead core 5 supports the cord tension of the carcass layer 3 generated by the internal pressure of the heavy load tire 1. The bead wire 8 is coated with a rubber material.
　ビードフィラー６は、ビードコア５を補強するためのゴム材であり、カーカス層３の両側端部がビードコア５の位置でタイヤ幅方向外側に折り返されることにより形成された空間に配置される。 The bead filler 6 is a rubber material for reinforcing the bead core 5, and is disposed in a space formed by folding both end portions of the carcass layer 3 outward in the tire width direction at the position of the bead core 5.
　カーカス層３とトレッド部４との間には、ベルト層７が設けられている。ベルト層７は、タイヤ周方向に沿って複数重ねられている。 A belt layer 7 is provided between the carcass layer 3 and the tread portion 4. A plurality of belt layers 7 are stacked along the tire circumferential direction.
　図２に示すように、ビードワイヤ８の巻き始め端部８ａと巻き終わり端部８ｂは、ビードコア５の径方向（重荷重用タイヤ１の径方向）に重複するように巻かれる。そして、図２に示すように、ビードワイヤ８の巻き始め端部８ａと巻き終わり端部８ｂとが重複する領域及びその近傍領域に、ゴムシート１０が巻き付けられる。ビードワイヤ８の巻き始め端部８ａと巻き終わり端部８ｂとを含む領域にゴムシート１０が巻き付けられる。換言すれば、ビードワイヤ８の一方の端部と他方の端部とを含む領域にゴムシート１０が巻き付けられる。また、一方の端部は、タイヤ周方向において、他方の端部から最も近い端部である。つまり、巻き始め端部８ａは、タイヤ周方向において、巻き終わり端部８ｂから最も近い端部である。巻き終わり端部８ｂは、タイヤ周方向において、巻き始め端部８ａから最も近い端部である。図２に示すように、ビードワイヤ８の巻き始め端部８ａと巻き終わり端部８ｂとが重複する領域は、それ以外の領域よりもビードワイヤ８の本数が一本多くなっている。以下では、ビードワイヤ８の巻き始め端部８ａと巻き終わり端部８ｂとが重複する領域及びその近傍領域とを合わせて、ビードワイヤ８の端部とよぶ。 2, the winding start end portion 8a and the winding end end portion 8b of the bead wire 8 are wound so as to overlap in the radial direction of the bead core 5 (the radial direction of the heavy load tire 1). Then, as shown in FIG. 2, the rubber sheet 10 is wound around a region where the winding start end portion 8 a and the winding end end portion 8 b of the bead wire 8 overlap and a region in the vicinity thereof. The rubber sheet 10 is wound around a region including the winding start end portion 8 a and the winding end end portion 8 b of the bead wire 8. In other words, the rubber sheet 10 is wound around a region including one end and the other end of the bead wire 8. One end portion is the end portion closest to the other end portion in the tire circumferential direction. That is, the winding start end 8a is the end closest to the winding end 8b in the tire circumferential direction. The winding end 8b is the end closest to the winding start 8a in the tire circumferential direction. As shown in FIG. 2, the number of the bead wires 8 is one more in the region where the winding start end portion 8a and the winding end end portion 8b of the bead wire 8 overlap than in the other regions. Hereinafter, the region where the winding start end portion 8a and the winding end end portion 8b of the bead wire 8 overlap and the vicinity thereof are referred to as the end portion of the bead wire 8.
　本実施形態で用いるゴムシート１０は天然ゴムを主体とするが、これに限定されない。
ゴムシート１０は、測定温度２５度の条件下で、ＪＩＳ　Ｋ６２５１にて測定する５０％伸び引っ張り応力Ｍ５０が、加硫後において１．０ＭＰａ以上である。なお、本実施形態で用いるゴムシート１０の寸法は、幅が４５ｍｍ、厚さが１ｍｍ、長さが４００ｍｍであるが、これに限定されない。 The rubber sheet 10 used in the present embodiment is mainly composed of natural rubber, but is not limited thereto.
The rubber sheet 10 has a 50% elongation tensile stress M50 measured by JIS K6251 at a measurement temperature of 25 degrees, and is 1.0 MPa or more after vulcanization. In addition, although the dimension of the rubber sheet 10 used by this embodiment is 45 mm in width, 1 mm in thickness, and 400 mm in length, it is not limited to this.
　図２に示すように、本実施形態ではビードワイヤ８の端部にゴムシート１０を３回巻いたが、ゴムシート１０を巻く回数は３回に限定されない。なお、ゴムシート１０を３回巻く場合、図２に示すようにゴムシート１０が３重に重ならないように巻くことが好ましい。また、図２に示す例では、ゴムシート１０は、円環周方向に螺旋状に巻かれているが、これに限定されない。巻き始め端部８ａと巻き終わり端部８ｂが含まれる巻き方であればよく、巻き方は限定されない。例えば、同じ場所を複数回巻いてもよい。ただし、ゴムシート１０が３重に重ならないように巻くことが好ましい。 As shown in FIG. 2, in this embodiment, the rubber sheet 10 is wound around the end of the bead wire 8 three times, but the number of times the rubber sheet 10 is wound is not limited to three. In addition, when winding the rubber sheet 10 3 times, it is preferable to wind so that the rubber sheet 10 may not be overlapped as shown in FIG. In the example illustrated in FIG. 2, the rubber sheet 10 is spirally wound in the circumferential direction of the ring, but is not limited thereto. The winding method is not limited as long as the winding start end portion 8a and the winding end end portion 8b are included. For example, the same place may be wound a plurality of times. However, it is preferable to wind the rubber sheet 10 so that it does not overlap three times.
　図３のフローチャートを参照して、本実施形態に係る重荷重用タイヤ１の製造方法を説明する。図３に示すように、重荷重用タイヤ１の製造方法は、ビードコア形成工程Ｓ１０と、ゴムシート巻き付け工程Ｓ２０と、加硫工程Ｓ３０とを含む。 With reference to the flowchart of FIG. 3, the manufacturing method of the heavy duty tire 1 which concerns on this embodiment is demonstrated. As shown in FIG. 3, the method for manufacturing the heavy duty tire 1 includes a bead core forming step S10, a rubber sheet winding step S20, and a vulcanizing step S30.
　ビードコア形成工程Ｓ１０は、１本のビードワイヤ８を円環状に複数回巻いてビードコア５を形成する工程である。 The bead core forming step S10 is a step of forming the bead core 5 by winding one bead wire 8 in an annular shape a plurality of times.
　ゴムシート巻き付け工程Ｓ２０は、ビードワイヤ８の巻き始め端部８ａと巻き終わり端部８ｂとを含む領域にゴムシート１０を巻き付ける工程である。 The rubber sheet winding step S20 is a step of winding the rubber sheet 10 around a region including the winding start end portion 8a and the winding end end portion 8b of the bead wire 8.
　加硫工程Ｓ３０は、ゴムシート１０が巻き付けられたビードコア５を含む生タイヤを加硫して重荷重用タイヤ１を得る工程である。 The vulcanization step S30 is a step of obtaining a heavy load tire 1 by vulcanizing a raw tire including the bead core 5 around which the rubber sheet 10 is wound.
　［比較結果］
　次に、図４を参照して比較結果について説明する。具体的には、ビードワイヤ８の端部をゴムシート１０で巻き付けた重荷重用タイヤ１（実施例）と、ビードワイヤ８の端部を従来の有機繊維テープで巻き付けた重荷重用タイヤ（比較例）を準備し耐久試験を行い、ビードコア５周りの亀裂面積を測定した。 [Comparison result]
Next, the comparison result will be described with reference to FIG. Specifically, a heavy load tire 1 (Example) in which the end portion of the bead wire 8 is wound with a rubber sheet 10 and a heavy load tire (comparative example) in which the end portion of the bead wire 8 is wound with a conventional organic fiber tape are prepared. An endurance test was performed, and the crack area around the bead core 5 was measured.
　図４に示す横軸は、ビードワイヤ８の端部を基準（０度）にした場合のタイヤ周方向の位置を示す。また、図４に示す縦軸は、ビードコア５周りの亀裂面積（指数）を示す。図４に示す縦軸の数値は低いほど耐セパレーション性がよいことを示す。 4 indicates the position in the tire circumferential direction when the end of the bead wire 8 is used as a reference (0 degree). The vertical axis shown in FIG. 4 indicates the crack area (index) around the bead core 5. The lower the numerical value on the vertical axis shown in FIG. 4, the better the separation resistance.
　図４に示すように、ビードワイヤ８の端部において、従来の有機繊維テープを巻き付けた場合に比べ、ゴムシート１０を巻き付けたほうが、亀裂面積が大きく減少していることがわかる。すなわち、有機繊維テープの代わりにゴムシート１０を用いることにより、ビードコア５周りの耐セパレーション性が向上していることがわかる。このような測定結果になった理由は、ゴム材で被膜されたビードワイヤ８とゴムシート１０との接着性が、ゴム材で被膜されたビードワイヤ８と従来の有機繊維テープとの接着性より良好なためである。 As shown in FIG. 4, it can be seen that the crack area is greatly reduced when the rubber sheet 10 is wound around the end portion of the bead wire 8 as compared with the case where the conventional organic fiber tape is wound. That is, it can be seen that the separation resistance around the bead core 5 is improved by using the rubber sheet 10 instead of the organic fiber tape. The reason for such a measurement result is that the adhesion between the bead wire 8 coated with the rubber material and the rubber sheet 10 is better than the adhesion between the bead wire 8 coated with the rubber material and the conventional organic fiber tape. Because.
　以上説明したように、本実施形態によれば、重荷重用タイヤ１はゴムシート１０を備え、ゴムシート１０は、ビードワイヤ８の巻き始め端部８ａと巻き終わり端部８ｂとを含む領域に巻き付けられる。これにより、従来の有機繊維テープを巻き付けた場合に比べ、重荷重用タイヤ１におけるビードコア５周りの耐セパレーション性が向上する。 As described above, according to the present embodiment, the heavy load tire 1 includes the rubber sheet 10, and the rubber sheet 10 is wound around a region including the winding start end portion 8 a and the winding end end portion 8 b of the bead wire 8. . Thereby, compared with the case where the conventional organic fiber tape is wound, the separation resistance around the bead core 5 in the heavy load tire 1 is improved.
　日本国特許出願第２０１６－２３８２３３号（出願日：２０１６年１２月８日）の全内容は、ここに援用される。 The entire contents of Japanese Patent Application No. 2016-238233 (Application Date: December 8, 2016) are incorporated herein by reference.
１　重荷重用タイヤ
２　ビード部
３　カーカス層
４　トレッド部
５　ビードコア
６　ビードフィラー
７　ベルト層
８　ビードワイヤ
８ａ　巻き始め端部
８ｂ　巻き終わり端部
１０　ゴムシート DESCRIPTION OF SYMBOLS 1 Heavy load tire 2 Bead part 3 Carcass layer 4 Tread part 5 Bead core 6 Bead filler 7 Belt layer 8 Bead wire 8a Winding start end part 8b Winding end part 10 Rubber sheet

Claims (3)

  1. 　ビードワイヤが円環状に複数回巻かれて形成されるビードコアを有する重荷重用タイヤであって、
    　ゴム材からなるゴムシートを備え、
    　前記ゴムシートは、前記ビードワイヤの一方の端部と他方の端部とを含む領域に巻き付けられ、
    　前記一方の端部は、タイヤ周方向において、前記他方の端部から最も近い端部であることを特徴とする重荷重用タイヤ。     A heavy duty tire having a bead core formed by winding a bead wire a plurality of times in an annular shape,
    It has a rubber sheet made of rubber material,
    The rubber sheet is wound around a region including one end and the other end of the bead wire,
    The one end is an end closest to the other end in the tire circumferential direction.
  2. 　前記ゴムシートは、測定温度２５度の条件下で、ＪＩＳ　Ｋ６２５１にて測定する５０％伸び引っ張り応力Ｍ５０が、加硫後において１．０ＭＰａ以上であることを特徴とする請求項１に記載の重荷重用タイヤ。 2. The heavy load according to claim 1, wherein the rubber sheet has a 50% elongation tensile stress M50 measured by JIS K6251 at a measurement temperature of 25 ° C. of 1.0 MPa or more after vulcanization. Heavy tire.
  3. 　ビードワイヤが円環状に複数回巻かれて形成されるビードコアを有する重荷重用タイヤの製造方法であって、
    　前記ビードワイヤの一方の端部と他方の端部とを含む領域にゴム材からなるゴムシートを巻き付ける工程と、
    　前記ゴムシートを巻き付けた後に加硫する工程と、
    　を備え、
    　前記一方の端部は、タイヤ周方向において、前記他方の端部から最も近い端部であることを特徴とする重荷重用タイヤの製造方法。     A method for manufacturing a heavy duty tire having a bead core formed by winding a bead wire in a plurality of annular shapes,
    Winding a rubber sheet made of a rubber material around a region including one end and the other end of the bead wire;
    Vulcanizing after winding the rubber sheet;
    With
    The one end is the end closest to the other end in the tire circumferential direction.
PCT/JP2017/042324 2016-12-08 2017-11-27 Heavy duty tire and method for manufacturing heavy duty tire WO2018105419A1 (en)

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EP17878992.1A EP3552848A4 (en) 2016-12-08 2017-11-27 Heavy duty tire and method for manufacturing heavy duty tire
US16/466,063 US20200031175A1 (en) 2016-12-08 2017-11-27 Heavy load tire and method for manufacturing heavy load tire
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111113969A (en) * 2018-10-30 2020-05-08 通伊欧轮胎株式会社 Bead member manufacturing method, bead member, and pneumatic tire
JP2020124859A (en) * 2019-02-05 2020-08-20 住友ゴム工業株式会社 Bead core storage device

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3473595A (en) * 1965-04-30 1969-10-21 Owens Corning Fiberglass Corp Bead constructions for tires
JPS551201A (en) * 1978-02-28 1980-01-08 Fuji Shoji Kk Bead wire
JPS63106103A (en) * 1986-06-20 1988-05-11 Bridgestone Corp High pressure pneumatic radial type for heavy load
JPH02256503A (en) * 1988-12-28 1990-10-17 Bridgestone Corp Bead wire/rubber compound
JPH11129348A (en) * 1997-10-29 1999-05-18 Bridgestone Corp End stopping device for tire beads
JPH11198617A (en) * 1998-01-09 1999-07-27 Yokohama Rubber Co Ltd:The Pneumatic tire
JP2001191754A (en) * 2000-01-14 2001-07-17 Bridgestone Corp Pneumatic tire and method of manufacturing the same
JP2004189146A (en) * 2002-12-12 2004-07-08 Bridgestone Corp Tire for heavy load
JP2008265563A (en) * 2007-04-20 2008-11-06 Bridgestone Corp Pneumatic tire for aircraft
US20100276054A1 (en) * 2006-10-16 2010-11-04 Giuseppe Cereda Process for manufacturing a tyre and tyre bead structure
JP2016088259A (en) 2014-11-04 2016-05-23 東洋ゴム工業株式会社 Pneumatic tire

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62261511A (en) * 1986-05-07 1987-11-13 Bridgestone Corp Pneumatic radial tire for high speed heavy load
JP2002192921A (en) * 2000-11-20 2002-07-10 Goodyear Tire & Rubber Co:The Spiral hexagonal bead and manufacturing method
JP4199536B2 (en) * 2002-12-27 2008-12-17 株式会社ブリヂストン Pneumatic tire
EP1844957A4 (en) * 2005-02-02 2008-11-05 Bridgestone Corp Pneumatic tire
CN201808408U (en) * 2010-04-27 2011-04-27 双钱集团(重庆)轮胎有限公司 Reinforced seam allowance structure of all-steal tire nylon cord fabrics
EP3057810A1 (en) * 2013-10-18 2016-08-24 E. I. du Pont de Nemours and Company Tire apex structure

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3473595A (en) * 1965-04-30 1969-10-21 Owens Corning Fiberglass Corp Bead constructions for tires
JPS551201A (en) * 1978-02-28 1980-01-08 Fuji Shoji Kk Bead wire
JPS63106103A (en) * 1986-06-20 1988-05-11 Bridgestone Corp High pressure pneumatic radial type for heavy load
JPH02256503A (en) * 1988-12-28 1990-10-17 Bridgestone Corp Bead wire/rubber compound
JPH11129348A (en) * 1997-10-29 1999-05-18 Bridgestone Corp End stopping device for tire beads
JPH11198617A (en) * 1998-01-09 1999-07-27 Yokohama Rubber Co Ltd:The Pneumatic tire
JP2001191754A (en) * 2000-01-14 2001-07-17 Bridgestone Corp Pneumatic tire and method of manufacturing the same
JP2004189146A (en) * 2002-12-12 2004-07-08 Bridgestone Corp Tire for heavy load
US20100276054A1 (en) * 2006-10-16 2010-11-04 Giuseppe Cereda Process for manufacturing a tyre and tyre bead structure
JP2008265563A (en) * 2007-04-20 2008-11-06 Bridgestone Corp Pneumatic tire for aircraft
JP2016088259A (en) 2014-11-04 2016-05-23 東洋ゴム工業株式会社 Pneumatic tire

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3552848A4

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111113969A (en) * 2018-10-30 2020-05-08 通伊欧轮胎株式会社 Bead member manufacturing method, bead member, and pneumatic tire
JP2020124859A (en) * 2019-02-05 2020-08-20 住友ゴム工業株式会社 Bead core storage device
JP7183836B2 (en) 2019-02-05 2022-12-06 住友ゴム工業株式会社 Bead core storage device

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